A tissue culture plate is a flat, rectangular laboratory tool used for high-throughput experiments and assays. It consists of different sizes like 6, 12, 24, 48, and 96 wells, uniformly-sized wells arranged in an 8x12 grid pattern. Typically made from clear polystyrene or similar plastic, the plate is designed for use in applications such as enzyme-linked immunosorbent assays (ELISA), cell culture, and various biochemical tests.